A National Weather Service smoke advisory for the Savannah area expired at 6 a.m. Sunday, after a fire at a Georgia Ports Authority Ocean Terminal filled the skies with smoke for miles Saturday.

Savannah Fire spokesman Mark Keller says the cause is unknown, and it may not be safe for investigators to take a closer look for several days.

The fire was reported shortly before 11:30 a.m. Saturday. Port officials say it broke out in a warehouse at Ocean Terminal No. 3 containing 5,600 tons of crude rubber used for making tires.

No injuries have been reported, and Ports Authority spokesman Robert Morris says no port employees were in the warehouse at the time of the fire.

UPDATE Sunday afternoon: Georgia Ports Authority Spokesman Robert Morris says in a statement that "the bulk of the fire" was extinguished by 8 a.m. Sunday. He says the Georgia Environmental Protection Division is working with the Ports Authority on the clean-up.